They are just following their leader.
Attack the true Conservatives first, later on they can take on anybody who's not a Democrat or Establishment Republican.
Note there is NO discussion of issues any more, just denigrating the Conservatives?
Donald J. Trump @realDonaldTrump 20m20 minutes ago
Millions of $'s of false ads, paid for by lobbyists-special interests of cheater @SenTedCruz and sleepy @JebBush, are now running in S.C.
Donald J. Trump @realDonaldTrump 33m33 minutes ago
"@copyover2001: @realDonaldTrump Do Americans really want a Canadian-born president? First non native born in history?"
Donald J. Trump @realDonaldTrump 38m38 minutes ago
"@by @tedcruz good I want to see the court decide what I was always told "natural born" means - born on American soil"
Donald J. Trump @realDonaldTrump 10h10 hours ago
How can Ted Cruz be an Evangelical Christian when he lies so much and is so dishonest?
You know what you DON'T see on Trump's twitter page? Anything about Obama, Clinton, or Sanders.
What do you see if you go to Ted Cruz's twitter page? 95% of posts are about Clinton.
What do you see if you go to Ben Carson's twitter page? Tweets about how we have to fix America.
What do you see if you go to Rubio's twitter page? Attacks on Hillary if anybody is mentioned.
So... apparently all of the candidates involved know the real problem America is facing. And one is attacking Republicans and Conservatives.
